Digital TDS Meter Water Purity Tester 0–9990 PPM | Qme

Keep tabs on your water quality with the Digital TDS Meter Water Purity Tester. Whether you're monitoring drinking water, a home filtration system, aquarium, hydroponics setup, or garden irrigation, this compact pen-style meter gives you an instant, accurate PPM (Parts Per Million) reading — no guesswork, no lab required.

With a wide measurement range of 0–9990 PPM, it covers everything from purified drinking water to well water, pool water, and beyond. The bright digital display makes readings easy to see at a glance, and the slim, pen-style design fits right in a pocket or drawer for whenever you need it.

Key Features

• Wide Range: Measures total dissolved solids (TDS) from 0 to 9990 PPM for versatile testing
• Instant Digital Readout: Clear LCD display delivers fast, easy-to-read results in seconds
• Compact Pen-Style Design: Slim, portable, and lightweight — take it anywhere
• Simple One-Button Operation: No complicated setup; ready to use straight out of the box
• Multi-Purpose Use: Ideal for drinking water, filtered water systems, aquariums, hydroponics, and garden irrigation
• Durable Construction: Quality build designed for repeated, reliable everyday use

What is TDS and Why Does It Matter?

TDS (Total Dissolved Solids) is a measure of the combined content of all inorganic and organic substances dissolved in water. Monitoring TDS helps you assess water cleanliness and the effectiveness of your filtration system. Lower TDS values generally indicate purer water, making this meter an essential tool for health-conscious households and hobbyists alike.

For more information on water quality and what TDS levels mean, visit the CDC's Drinking Water Quality Resource.

Who Is This For?

• Homeowners using reverse osmosis or filtered water systems
• Aquarium and fish tank enthusiasts
• Hydroponic and indoor plant growers
• Garden and irrigation water monitoring
• Anyone curious about the quality of their tap or well water

Product Details

• Measurement Range: 0–9990 PPM
• Display: Digital LCD
• Color: Black
• Design: Pen-style, portable
• Vendor: Qme

Learn more: Hard water

Frequently Asked Questions

Q: What does a TDS meter measure and how does the 0–9990 PPM range work?

A: A TDS (Total Dissolved Solids) meter measures the concentration of dissolved substances in water, expressed in Parts Per Million (PPM). This digital water tester covers a range of 0–9990 PPM, making it suitable for testing purified drinking water (low PPM) all the way up to well water, tap water, pool water, or nutrient-rich hydroponic solutions (higher PPM). Simply dip the sensor tip into the water sample and the digital display shows your reading instantly.

Q: Can I use this TDS meter for my aquarium or hydroponic garden?

A: Absolutely! This TDS meter is a great fit for aquarium hobbyists who want to maintain optimal water conditions for fish and plants, as well as hydroponic growers monitoring nutrient levels in their water supply. It's also ideal for checking home water filtration systems, drinking water, and garden irrigation sources.

Q: How do I use and maintain the digital water tester?

A: Using the TDS meter is simple — turn it on with the power button, dip the sensor tip (up to the marked immersion line) into your water sample, wait a few seconds for the reading to stabilize, then read the PPM value on the LCD display. After use, rinse the sensor with clean water and dry it before storing. The pen-style cap protects the sensor when not in use.

Q: How accurate is this TDS water tester?

A: This digital TDS meter is designed for reliable everyday spot-checking of water quality across its full 0–9990 PPM range. It provides a quick and consistent reference for monitoring changes in your water's dissolved solids over time, making it a practical tool for home, garden, and hobby use.